Pump construction



y 8, 1965 H. J. SADLE'R ETAL. 3,183,842

PUMP CONSTRUCTION i2 :Sheei'hs-Sheet l Fild Nov. 1, 1963 INVENTORS. HARRY J SADLEF? E. COOK AT TORNE Y5 ERNEST y 1965 H. J. SADLER ETAL 3,183,842

PUMP CONSTRUCTION Filed Nov. 1, 1963 2 Sheets-Sheet 2 FIG. 4

INVENTORS. HAPPY J1 SADLER EB/i'fNEST .E'. COOK United States Patent 3,183,842 PUMP CONSTRUCTION Harry J. Sadler, Minneapolis, and Ernest E. Cook, Coon Rapids, Minn., assignors to Hypro Engineering, Inc., Minneapolis, Minn a corporation of Minnesota Filed Nov. 1, 1963, Ser. No. 320,869 4 Claims. (Cl. 103-117) rubber-like rotor wherein greater use and advantage of the all flexible rotor type impeller, by retaining almost complete circumferential engagement, i.e. ten out of a possible twelve blades in constant contact with the cylinder wall and retaining almost perfect balance thereof as well. A slight advantage is thus obtained over our slightly more costly structure which employs roller elements, interposed between the circumferentially spaced, flexible resilient impeller elements, but which must use fewer flexible blades i.e. six out of a possible twelve blades for contact with the cylinder wall of equal size. In the instant structure the elimination of one or more of the flexible blades have been replaced with one ormore circumferentially spaced relatively rigid sliding vane-type impeller elements, whereby to produce a structure which is more eflicient for certain specialized uses.

A further object of our invention is the provision of a pump of the type immediately above described which incorporates a minimum of working parts, is relatively inexpensive to produce, requires a minimum of servicing, and is rugged, durable, and efiicient in operation.

The above and still further objects of our invention will become apparent from the following detailed specification, appended claims, and attached drawings.

Referring to the drawings wherein like characters indicate like parts throughout the several views:

FIG. 1 is a view in end elevation of a pump constructed in accordance with our invention;

FIG. 2 is a view in side elevation of the structure of FIG. 1;

FIG. 3 is a view in vertical section as seen from the line 33 of FIG. 2 on an enlarged scale, portions thereof broken away;

FIG. 4 is a view in horizontal section as seen from the line 4-4 of FIG. 1 on an enlarged scale;

FIG. 5 is a view in elevation of our novel rotor, as seen from one end thereof;

FIG. 6 is a view in side elevation of our novel rotor, portions thereof broken away and shown in section;

FIG. 7 is a view in elevation of the core element utilized in our novel rotor; and

FIG. 8 is an exploded view in perspective of some of the parts utilized in our novel rotor.

Referring with greater particularity to the drawings, the numeral 10 indicates in its entirety a housing of conventional design and having a removable end plate 11 thereon, which cooperates to define a chamber 12 having spaced parallel end walls 13 and a cylindrical side wall 14. The diametrically opposed inlet and outlet ports communicating with the chamber 12 are identifiable respectively by 15 and 16. Iournalled for rotation in a bearing boss 17 carried by permanent housing end wall 18, in radially offset relation to the axis of the cylindrical chamber 12, is a shaft 19. Shaft 19 terminates adjacent the removable end plate 11 and has mounted fast thereon for rotation within the chamber 12 a rotor 20,

3,183,842 Patented May 18, 1965 which, as seen particularly in FIG. 4, extends between the end walls 13 of the chamber 12.

Rotor 20, as shown, comprises a diametrically enlarged hub 21 which is made up of a tubular core element 22 fast on the shaft 19 and a radially outer portion 23 of rubber-like material, and which is vulcanized or otherwise bonded to the peripheral surface of the core element 22. Core element 22 may be formed from steel or other material to which rubber-like radially outer portion 23 may be bonded.

Formed integrally with and projecting generally radially outwardly from the rubber-like outer portion 23 are a plurality of circurnferentially spaced relatively flexible vane-like impeller elements 24, the radially outer limits of which are in constant sweeping engagement with the cylindrical side wall 14 during rotation of the rotor 20, and which are flexed rearwardly in varying degrees during such rotation due to offset relationship of the shaft 19 and rotor 20 within the chamber 12. This relationship creates a plurality of circumferentially spaced axially extended pockets 25 of varying capacity.

As shown particularly in FIGS. 3 and 5, diametrically opposed pockets 25a are of greater circumferential dimensions than the pocket 25. Each of the pockets 25a is formed to define an axially extended radially outwardly opening channel 26 in which is received for limited reciprocal movements a relatively rigid impeller blade 27. In order to maintain the radially outer limits 280i each of the blades 27 constantly in substantial engagement with the cylindrical side wall 14 of the chamber 12 during rotation of the rotor 20, impeller blades 27 have an axially reduced interconnecting portion 29 which is slidably received in aligned axially outwardly opening slots 30, 31, in the shaft 19 and core element 22,.respectively. As shown particularly in FIG. 4, these slots 30, 31 open outwardly in the direction of the removable end plate 11 so as to facilitate assembly.

Our invention has been throroughly tested and found to be completely satisfactory for the accomplishment of the above objects; and while we have disclosed a preferred embodiment thereof, same may well be capable of modification without departure from the scope and spirit of the appended claims.

What is claimed is:

1. In a fluid pump, a housing defining:

(a) a chamber having spaced parallel end walls and a cylindrical side wall, and having cirounrferentially spaced inlet and outlet ports communicating with said chamber,

(b) a shaft j-ournalled for rotation in at least one of said end walls on an axis radially offset from the axis of said chamber,

(0) a rotor fast on said shaft within said chamber,

said rotor comprising:

[(1) a diametrically enlarged hub concentric with said shaft and extending between said end walls,

(2) a plurality of circumferentially spaced radially outwardly projecting flexible resilient vanelike impeller elements fast on said hub,

(3) said impeller elements also extending between said end walls and having constant sweeping engagement with said cylindrical side Wall during rotation thereof and being flexed rearwardly in varying degrees during such rotation,

(4) said impeller elements defining a plurality of circumferentially spaced axially extended pockets of varying capacity,

(d) one of said pockets defining a radially outwardly opening axially extended channel, and

(e) -a relatively rigid impeller blade mounted and guided in said channel for limited reciprocal movements generally radially of said rotor and adapted to constantly engage said cylindrical side wall during rotation of said rotor.

2. In a fluid pump, a housing defining:

(a) a-chamber having spaced parallel end walls and a cylindrical side wall, and having circumferentially spaced inlet and outlet ports communicating with said chamber,

(b) a shaft journalled fior rotation in at least one of said end walls on an axis radially offset from the axis of said chamber,

(c) a rotor fast on said shaft Within said chamber,

said rotor comprising:

[(1) a vdiametrically enlarged hub concentric with (d) two of said pockets being in diametrically opposed relationship :and each thereof defining a r-adially outwardly opening channel,

(e) a relatively rigid plate-like impeller element mounted and guidedin each of said channels for limited generally radial reciprocal movements,

(i) said last-mentioned impeller elements having an interconnecting portion which projects through and is slidably received within said shaft,

(g) the combined radial dimension of said last-men tioned impeller elements and their interconnecting portion corresponding roughly to the diameter of said chamber whereby reciprocalmovements will be imparted to said rigid impeller elements iupon rotation of said rotor as the radially opposite ends thereof are in constant substantial engagement with said cylindrical side wall.

3. The structure defined in claim 2 in which said shaft is journalled .for rotation in but one of said end walls and terminates in a free end in closely spaced relation to the other of said end walls, said free'end of said shaft being formed to define an axially outwardly opening slot which extends diametrically therethrough and which s'lidably receives said interconnecting portion. a

4. The structure declined'in claim 3 in which the axial depth of said slot is materially less than the axial dimension of said rotor and said interconnecting portion is materially reduced with respect to the axial dimensions of the rigid plate-like impeller elements.

References Cited by theExaminer UNITED STATES PATENTS 1,848,754 3/ 32 Lanzerotti-Spina 103137 2,648,287 8/53 Thoren et al. 103-117 2,712,792, 7/55 Snyder 103117 2,789,511 4/57 Doble 103117 JOSEPH H. BRANSON, 111., Primary Examiner. 

1. IN A FLUID PUMP, A HOUSING DEFINING: (A) A CHAMBER HAVING SPACED PARALLEL END WALLS AND A CYLINDRICAL SIDE WALL, AND HAVING CIRCUMFERENTIALLY SPACED INLET AND OUTLET PORTS COMMUNICATING WITH SAID CHAMBER, (B) A SHAFT JOURNALLED FOR ROTATION IN AT LEAST ONE OF SAID END WALLS ON AN AXIS RADIALLY OFFSET FROM THE AXIS OF SAID CHAMBER, (C) A ROTOR FAST ON SAID SHAFT WITHIN SAID CHAMBER, SAID ROTOR COMPRISING: (1) A DIAMETRICALLY ENLARGED HUB CONCENTRIC WITH SAID SHAFT AND EXTENDING BETWEEN SAID END WALLS, (2) A PLURALITY OF CIRCUMFERENTIALLY SPACED RADIALLY OUTWARDLY PROJECTING FLEXIBLE RESILIENT VANELIKE IMPELLER ELEMENTS FAST ON SAID HUB, (3) SAID IMPELLER ELEMENTS ALSO EXTENDING BETWEEN SAID END WALLS AND HAVING CONSTANT SWEEPING ENGAGEMENT WITH SAID CYLINDRICAL SIDE WALL DURING ROTATION THEREOF AND BEING FLEXED REARWARDLY IN VARYING DEGREES DURING SUCH ROTATION, (4) SAID IMPELLER ELEMENTS DEFINING A PLURALITY OF CIRCUMFERENTIALLY SPACED AXIALLY EXTENDED POCKETS OF VARYING CAPACITY, (D) ONE OF SAID POCKETS DEFINING A RADIALLY OUTWARDLY OPENING AXIALLY EXTENDED CHANNEL, AND (E) A RELATIVELY RIGID IMPELLER BLADE MOUNTED AND GUIDED IN SAID CHANNEL FOR LIMITED RECIPROCAL MOVEMENTS GENERALLY RADIALLY OF SAID ROTOR AND ADAPTED TO CONSTANTLY ENGAGE SAID CYLINDRICAL SIDE WALL DURING ROTATION OF SAID ROTOR. 